/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.web.databinding.converters

import groovy.transform.CompileStatic

import org.springframework.web.multipart.MultipartFile

import grails.databinding.converters.ValueConverter

/**
 * @author Jeff Brown
 * @since 2.3
 */
@CompileStatic
class ByteArrayMultipartFileValueConverter implements ValueConverter {

    Object convert(Object value) {
        MultipartFile mf
        if (value instanceof MultipartFile) {
            mf = (MultipartFile) value
        } else if (value instanceof Collection) {
            def coll = (Collection) value
            if (coll.size() > 0) {
                def firstElement = coll[0]
                if (firstElement instanceof MultipartFile) {
                    mf = (MultipartFile) firstElement
                }
            }
        }
        mf?.bytes
    }

    Class<?> getTargetType() {
        byte[]
    }

    boolean canConvert(Object value) {
        def canConvertValue = false
        if (value instanceof MultipartFile) {
            canConvertValue = true
        } else if (value instanceof Collection) {
            if (value.size() > 0 && ((Collection) value)[0] instanceof MultipartFile) {
                canConvertValue = true
            }
        }
        canConvertValue
    }

}
